History YMMV / KingdomRush

*** [[TurtlePower Blacksurge]]: Renders your towers useless, gets into a defensive stance where it regenerate much of its HP in seconds while ''also'' becoming immune to damage and being blocked!

** Rising Tides' Greenfins will throw a net over a character, immobilizing them completely for a period of time. They're pretty weak, however.

*** Blacksurge: Renders your towers useless, gets into a defensive stance where it regenerate ALL its HP in seconds and ''also'' become immune to damage and being blocked!'
*** Bloodshell: Tons of health, Non-Magical attacks do next to nothing against it (Artillery does jack), and it hurts like hell. Basically, a stronger Dark Slayer.
*** Bluegale: Immune to magic, casts storms that obscure vision AND makes you unable to select any towers affected.

*** Bluegale: Immune to magic, casts storms that obscure vision, disable towers AND makes you unable to select any towers affected.

*** Blacksurge: 'Sup, I can render your towers useless, regenerate ALL of my HP in seconds and also become immune to damage and being blocked!'
*** Bloodshell: 'Sup, your artillery towers don't hurt me and my defence means I can stand toe to toe with your Barracks forever!'
*** Bluegale: 'Sup, I'm immune to magic, oh and I can also make this nifty cloud that not only blocks your vision but also stops you form clicking on your towers to upgrade them or move barracks.'

*** Blacksurge: 'Sup, I can regenerate ALL of my HP in seconds and also become immune to damage and being blocked!'
*** Bloodshell: 'Sup, your artillery towers don't hurt me and my defence means I can stand toe to toe with your Barracks forever!'

*** To think about it, these stages are [[BrutalBonusLevel elite stages]], after all...

* ThatOneBoss: The FinalBoss of ''Frontiers''. It seems like a standard FlunkyBoss at first, but when you "kill" it, it explodes into many small blobs which you must destroy as much of, because they'll reform into the boss (but its Maximum Health will be lower if you killed some of them). The battle only gets harder as it goes on as it then uses EyeBeams to outright ''destroy'' your towers (This is the ''only enemy in the series'' that can do so, by the way), making it harder to kill his smaller Mooks. In order to beat him, you need to keep killing him and his blobs before he destroys your defences and his hordes get through.

* DemonicSpiders: Tricksters from Frontiers. These guys have quite a bit of health, and will resurrect all slain savages around them into voodoo zombies with a lot of health. Worse still, your towers [[ArtificialStupidity stupidly]] attack the zombies instead of [[ShootTheMedicFirst aiming for the trickster first]]! If you don't use a Rain Of Fire or reinforcements to keep it busy, your defences will get overrun by stupid voodoo zombies.
** Savant Saurians, if not killed quickly enough. These guys can summon Broodguards (gets faster when near death, easy), Darters (teleports, irritating), as well as Nightscales (cloaks when at half their health, very dangerous). If the Savant summons a Nightscale when it's halfway through, the Nightscale will probably cloak and waltz past half your defences!

* GameBreaker: Ashbite the dragon seems to be one in terms of heroes. He has ''extremely'' high health, does a lot of area damage with his attacks (one of which can instakill), can slow groups of enemies by a large amount, levels up the fastest, and flies, making 80% of enemies unable to attack him at all. Of course, [[BribingYourWayToVictory you need to buy him]] for ''a lot'' of money (even more than the game itself!) to use him.

** Parasytes in ''Frontiers''. They're only found in a few levels, but their "[[FaceFullOfAlienWingWong attack]]" renders a soldier useless and will make them explode into a tough Reaper if not removed. This pretty much kills your barracks defences as a facehugged soldier isn't considered dead yet and more will not respawn. Worse still, they will be periodically spawned in groups during later waves, and worst of all, don't give any gold when killed.

* ScrappyMechanic: Enemies with ranged attacks = Annoying micromanagement with moving rally points, [[ArtificialStupidity or the soldiers sit there and do nothing.]]

* DemonicSpiders: Tricksters from Frontiers. These guys have quite a bit of health, and will resurrect all slain savages around them into voodoo zombies with a lot of health. Worse still, your towers [[ArtificialStupidity stupidly]] attack the zombies instead of [[ShootTheMedicFirst aiming for the trickster first]]!

** Parasytes in ''Frontiers''. They're only found in a few levels, but their "[[FaceFullOfAlienWingWong attack]]" renders a soldier useless and will make them explode into a tough Reaper if not removed. This pretty much kills your barracks defences as a facehugged soldier isn't considered dead yet and more will not respawn. Worse still, they will keep on coming in later waves, and worst of all, don't give any gold when killed.

** Parasytes in ''Frontiers''. They're only found in one level, but their "[[FaceFullOfAlienWingWong attack]]" renders a soldier useless and will make them explode into a tough Reaper if not removed. This pretty much kills your barracks defences as a facehugged soldier isn't considered dead yet and more will not respawn. Worse still, they will keep on coming in later waves, and worst of all, don't give any gold when killed.

** Parasytes in ''Frontiers''. They're only found in one level, but their "[[FaceFullOfAlienWingWong attack]]" renders a soldier useless and will make them explode into a tough Reaper if not removed. This pretty much kills your barracks defences as a facehugged soldier isn't considered dead yet and more will not respawn.

** If you are doing Iron Challenges, Warg's will cause hair loss. Since you only have 1 Health, Warg's are easily able to slip past your defences for an easy win.

* BigLippedAlligatorMoment: Come ON, who was expecting The Juggernaut?

** If you are doing Iron Challenges, Warg's will cause hair loss. Since you only have 1 Health, Warg's are easily able to slip past your defences for an easy win.

* GoddamnedBats: Unfortunately, the nature of the game that these easily slain, frequently encountered foes actually ARE a threat, as they can come in a ZergRush that your towers may have a bit of difficulty handling.